A simple route for additive manufacturing of 316L stainless steel via Fused Filament Fabrication
A simple route for additive manufacturing of 316L stainless steel via Fused Filament Fabrication
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DOI：
10.1016/j.jmapro.2021.04.055
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发表时间：
2021-05-01
影响因子：
6.2
通讯作者：
Nanni, F.
中科院分区：
文献类型：
--
作者：
Sadaf, M.;Bragaglia, M.;Nanni, F.
低成本的材料挤压（MEX）增材制造技术可以为制造具有复杂几何形状的金属零件提供一种经济的选择，而不是传统制造或更昂贵的粉末床熔化（PBF）技术。在这项工作中，开发了一种由316L不锈钢粉（65%体积）和单组分粘结剂（LDPE）系统组成的原料。使用单一粘结剂而不是金属MEX中常用的两种或更多组分，在成本和化学品使用方面引入了一种新颖且更可持续的解决方案。研究了原料的流变性和可加工性，并对样品进行了3D打印。在1380℃的氢气氛下进行脱脂和烧结，并从力学和微观结构的角度对所得到的金属部件进行了表征。结果表明，烧结后的钢的密度达到理论密度的93%，并且存在奥氏体相，证实了在还原气氛下的后处理保护了样品免受氧化和其他污染。烧结3D零件的晶粒尺寸接近45 μ m，屈服点为250 MPa，抗拉强度为520 MPa，维氏显微硬度为285 HV，这是退火钢的典型特征。
The low-cost material extrusion (MEX) additive manufacturing technology can offer an economical alternative to manufacture metal parts with complex geometry over traditional manufacturing or the more expensive powder bed fusion (PBF) techniques. In this work, a feedstock made of 316L stainless steel powder (65 % by volume) and a single component binder (LDPE) system was developed. The use of a single binder rather than two or more components, commonly used in metal MEX, introduces a novel and more sustainable solution in terms of costs and less use of chemicals. The rheology and pmcessability of the feedstocks were studied, and samples were 3D printed. Debinding and sintering under a hydrogen atmosphere at 1380 degrees C were performed, and the resulting metallic parts have been characterized by a mechanical and microstructural point of view. The results show a sintered steel having 93 % of the theoretical density and an austenitic phase confirming that the post-processing under reductive atmosphere protected the samples from oxidation and other contamination. The sintered 3D parts show a grain size of similar to 45 mu m, a yield point of 250 MPa, a tensile strength of 520 MPa, and a Vickers microhardness of 285 HV typical of annealed steel.